Add link to the VM and slides in readme

Author: antitoine

README.md

@@ -5,3 +5,7 @@
 **Hyperledger Global Forum 2018 - Workshop**
 
 This repository contains all the code for Hyperledger Fabric's learning workshop using exclusively Golang.
+
+Slides are available here: [chainhero.io/hlgf-ws-slides](https://chainhero.io/hlgf-ws-slides)
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+Virtual Machine is available here: [chainhero.io/hlgf-ws-vm](https://chainhero.io/hlgf-ws-vm) ([VirtuelBox](https://www.virtualbox.org/wiki/Downloads) required)